28381930219400 has 24 divisors (see below), whose sum is σ = 65987987760570. Its totient is φ = 11352772087680.

The previous prime is 28381930219397. The next prime is 28381930219411. The reversal of 28381930219400 is 491203918382.

It can be written as a sum of positive squares in 3 ways, for example, as 23916070844836 + 4465859374564 = 4890406^2 + 2113258^2 .

It is a Harshad number since it is a multiple of its sum of digits (50).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70954825349 + ... + 70954825748.

Almost surely, 2^{28381930219400} is an apocalyptic number.

28381930219400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28381930219400 is an abundant number, since it is smaller than the sum of its proper divisors (37606057541170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28381930219400 is a wasteful number, since it uses less digits than its factorization.

28381930219400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141909651113 (or 141909651104 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 50.

The spelling of 28381930219400 in words is "twenty-eight trillion, three hundred eighty-one billion, nine hundred thirty million, two hundred nineteen thousand, four hundred".